Chemistry

Just how thick is molasses? Density and specific gravity of liquids are determined with an instrument called a hydrometer. In this experiment, students construct a hydrometer and calibrate it using liquids with known density or specific gravity value...

Why do road crews spread salt on the roads in the winter? Is one salt better than another to melt snow and ice? Discuss colligative properties as students determine the effect of dissolved impurities on the freezing point of a substance and compare t...

It seems counterintuitive-when freezing weather is predicted, orange growers spray the trees with water to prevent the fruit from freezing! The water actually releases heat when it solidifies. The purpose of this experiment is to investigate the soli...

The forces that act between molecules play a significant role in many aspects of chemistry. The boiling point of liquids and the solubility of solids, even the structure of DNA and proteins, all depend on intermolecular forces. This activity consists...

Melting points are not only used to identify pure substances; they are also used to determine the purity or composition of mixtures. In this advanced melting point kit, students will develop a melting point curve based on known compositions of a mixt...

Melting point determination is one of the most common analytical tests used to identify unknown substances. In this introductory kit, students investigate the melting points of four non-toxic pure substances. Kit includes capillary melting point tube...

What kinds of forces hold atoms together? How does the nature of the bonding force affect the properties of a material? Finding patterns in the properties of substances can help students understand how and why atoms join together to form compounds. I...